Mermaid Plugin: Render Inline Mermaid

[amessbee]

Changes include:

adding mermaid and mermaid vite plugin
update to sequence diagram on orchestration to use inline mermaid

Ref(s):

• closes Multiple Files for Sequence Diagrams #1242

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[toliaqat]

The deleted image has a reference in other files:

documentation/main/guides/orchestration/contract-walkthroughs/cross-chain-unbond.md

Lines 3 to 4 in c1e76b7

	<!-- XXX the diagram below is a useful part of the page but it needs to be updated before it is uncommented. -->
	<!-- ## Overview Diagram

Please update the comment or not delete the image if the comment is important and we want to bring the image back in the future. If I were you, I would not add mermaid of the deleted image, and instead undelete the file to merge the original PR as soon as possible.

[amessbee]

The deleted image has a reference in other files:

documentation/main/guides/orchestration/contract-walkthroughs/cross-chain-unbond.md

Lines 3 to 4 in c1e76b7

	<!-- XXX the diagram below is a useful part of the page but it needs to be updated before it is uncommented. -->
	<!-- ## Overview Diagram

Please update the comment or not delete the image if the comment is important and we want to bring the image back in the future. If I were you, I would not add mermaid of the deleted image, and instead undelete the file to merge the original PR as soon as possible.

Do you think I should undelete other two unused SVG files too? Since, this is not the topic of the current PR, I guess we can keep them and create a separate PR of deleting unused assets?